The main mid-term manifestation of coronary heart disease is angina pectoris. Coronary heart disease is the abbreviation of coronary heart disease, angina type is the most common. Due to long-term lipid metabolism abnormalities in the body, a large number of lipid deposits in the coronary artery lining, resulting in coronary atherosclerotic plaque and decreased elasticity, leading to narrowing of the lumen of the blood vessel, blood flow obstruction caused by cardiac ischemia, resulting in angina pectoris. Early symptoms of coronary heart disease are often atypical, and most patients have symptoms of insufficient blood supply to the myocardium, such as chest tightness, discomfort in the precordial area, and fatigue, only after extreme exertion. With the progress of the disease, coronary heart disease in the middle stage, patients often to angina attack symptoms as the main performance. Angina due to coronary heart disease is divided into two types: stable and unstable. Stable angina is exertional angina that occurs for more than one month; unstable angina occurs at irregular times and manifests itself as severe, crushing chest pain accompanied by nausea, vomiting and other discomforts. It can be relieved with drugs such as nitroglycerin and isosorbide mononitrate. Angina pectoris that lasts more than half an hour and cannot be relieved with medication is considered a possible myocardial infarction and needs to be taken to the hospital as soon as possible. Coronary heart disease symptoms are very serious in the late stage, because of the complete obstruction of coronary blood vessels, resulting in myocardial infarction, heart failure and even sudden cardiac death, the death rate is relatively high. If you are not feeling well, you should seek medical attention and follow the doctor’s instructions.